We hit peak civilization in the 70s. All downhill from there.
The IQ scores of young people have begun to fall after rising steadily since the Second World War, according to the first authoritative study of the phenomenon. The decline, which is equivalent to at least seven points per generation, is thought to have started with the cohort born in 1975, who reached adulthood in the early Nineties.
Scientists say that the deterioration could be down to changes in the way maths and languages are taught, or to a shift from reading books to spending time on television and computers..
The turning point marks the end of a well-known but poorly understood trend known as the Flynn effect, in which average IQs have risen by about three points a decade for the past 60 or 70 years..